NOCO Boost X GBX155 4250A UltraSafe Jump Starter Power Pack 12V Battery Booster

The NOCO Boost X GBX155 is a 4250A UltraSafe lithium jump starter for 12V batteries, rated for petrol engines up to 10.0L and diesel engines up to 8.0L. It is part of NOCO's Boost X range and suits drivers of larger vehicles who need a portable jump starter that also works as a 60W USB-C power bank and 500-lumen torch.

This listing is the GBX155. The Boost X range is also available as the NOCO Boost X GBX45 1250A.

Key specifications

• Peak starting current: 4250A
• Engine rating: Up to 10.0L petrol, up to 8.0L diesel
• Battery types: 12V lead-acid batteries
• Internal battery: 99Wh lithium-ion
• USB-C Power Delivery: 60W in and out
• USB-A output: 5V 2.1A (10W max)
• LED torch: 500 lumens with SOS and strobe modes
• Protection: IP65 (with ports closed), spark-proof, reverse polarity protection
• Size and weight: 175 x 305.6 x 69.1 mm, 2.64 kg

NOCO Boost X GBX155 overview

The GBX155 delivers extreme power for the most demanding jump starts, using NOCO's latest PX Lithium Technology for high output, ultra-fast charging and versatility. This is a ground-up new series rather than an incremental upgrade, offering more starting power and maximum power delivery paired with USB-C Power Delivery technology.

• Rated at 4250A peak starting current
• Jump starts 12V batteries
• Up to 10.0L petrol engines
• Up to 8.0L diesel engines

Spark-proof with reverse polarity protection

NOCO's UltraSafe 2.0 technology retains the spark-proof, mistake-free design and reverse polarity protection of the original, and adds enhanced thermal efficiency and power management for better performance and longer battery life.

Start the vehicle within 60 seconds with auto power conservation

Press the power button to begin a jump-start sequence. The unit will remain active for 60 seconds; after that it powers down automatically and must be switched off and back on to start a new sequence. A yellow power LED indicates the 60-second window has elapsed and a reset is needed.

Up to 60W fast charging for your devices

The built-in power bank delivers 60W via USB-C Power Delivery, both in and out, for charging phones, tablets, laptops, wearables and other USB-C devices. A USB-A port provides up to 5V 2.1A (10W max) for standard devices.

Ultra-bright 500-lumen torch

The GBX155 includes a 500-lumen LED torch with multiple brightness modes, SOS and emergency strobe — a practical tool for roadside emergencies and everyday use.